DISEASES OF THE Canrarou sates & “TECHNICAL DATA 
age '2 
~ 
‘BACTERIAL WILT. (CONT'D) 
CONTROLS : 
-(b) Same formulas and application technique as outlined in controls for. 
“ANTHRACNOSE under headings (a), (b), (c), (d), will be found effective 
‘in control of both the BEETLE and WILT BACTERIA. 
MACROSPORIUM LEAF BLIGHT: 
SYMPTOMS: First spots to appear on leaves are small, circuldr and slightly 
water-—soaked., They enlarge and show concentric rings and a definite margin on 
.the upper side of leaf. Spots vary in diameter from pinpoint to zx" or more. 
CAUSES: FUNGUS. ORGANISM, over-—wintering on diseased host~plant and diseased seed. 
CONTROLS: 
(4) .Proper crop: rotation, 
(2) Treatment of seed with: Spergon or Arasan before planting. - 
(3) Formulas as outlined in controls for ANTHRACNOSE under headings .{(a), (b), 
(c), (d), are effective for MACROSPORIUM LEAF BLIGHT. 
POWDERY MILDEW: 
SYMPTOMS: Leaves and young stems develop circular, whitish, powdery spots, 
which shortly turn brown and dry. In severe cases, plants become yellowish 
and leaves die. 
‘CAUSES: A FUNGUS ORGANISM carried by wind and water. Over—winters in infected 
plants, Host plants: Cucumber, Squash, Pumpkin, Gourd. 
CONTROLS ; 
(4)) Extremely difficult to chemically control. 
(2) In areas subject to mildew attacks, plant resistant varieties as outlined 
in:‘our listings. 
-FUSARIUM WILT: 
SYMPTOMS: In some instances, confused with Bacterial Wilt. Disease can appear 
at dlmost any growth stage~--seedlings before they break soil~--older seedlings 
With a root rot---still others may show signs of wilting with no visible evi- 
nic dence of infection. When disease strikes more mature plants, one runner ata 
time wilts followed with dark~brown lesions on the stem, close to ground. When 
ino! aintecbion’ occurs until after fruits,approach(maturity, “fruit rot; appears ‘in 
stem—end of fruit.' 
_ With certain moisture conditions, dead lesions on infected plants develop and 
-. become covered with salmon-colored masses of fungus spores, 3 
' CAUSES: A FUNGUS ORGANISM carried on seed, This organism:can live many years in 
the soil. 
CONTROLS: 
(4) Very difficult to control, Some results have been obtained by treating 
seeds with Arasan, Semesan and Spergon, prior to planting. 
(is This issue of TECHNICAL DATA covering DISEASES OF THE CANTALOUPE, is second in its 
}" group, covering principal diseases, their causes, symptoms of all of the cucurbit 
; species. ; 








So many of our good friends and customers have written in for regular mailings of ad-— 
ditional copies for their sales staffs that we hardly find it necessary to mention 
again that additional copies of any number are availabie for you without cost -—- this 
bullétin, and all‘subsequent.ones., Increase your dealer's confidence in you and in 
YOUR STOCKS by having at your salesman's fingertips, information of this nature, by 
which they can intelligently inform. . 
_. In closing, we might say that information of this type must, of necessity be generaliz— 
ed. In certain areas, new specialized types of controls -have been used and found 
successful, which are not covered-in this bulletin, We would be very glad to correspond 
with you, or any of your salesmen on any particular problems developing in your territory. 
ate LAWRENCE ROBINSON & SONS 
ry o-— Bulletin 3 
al an 14947 Research Department: 
